Re: [NAnt-users] How do you detect if a property has not been defined?

Noel Gifford Sat, 22 Jul 2006 21:52:09 -0700

You need to include XYZ in single quotes because you want to pass the string to the property::exists method and not evaluate the XYZ property.

Try:

Noel

From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Frederick
Sent: Friday, July 21, 2006 2:00 PM
To: nant-users@lists.sourceforge.net
Subject: [NAnt-users] How do you detect if a property has not been defined?

Uh, I'm a little lost here. Sorry, beginner question.

I want to detect if a property has/has not been defined and do conditional processing based on whether or not the property exists. I thought I should do:

And then I run it:

C:\build\BuildIt>nant -f:prop.build
NAnt 0.85 (Build 0.85.2344.0; rc4; 6/2/2006)
Copyright (C) 2001-2006 Gerry Shaw
http://nant.sourceforge.net

Buildfile: file:///C:/build/BuildIt/prop.build
Target framework: Microsoft .NET Framework 2.0

BUILD FAILED

C:\build\BuildIt\prop.build(2,3):
Property evaluation failed.
_expression_: ${property::exists(XYZ)}
^^^
Property 'XYZ' has not been set.

Total time: 0 seconds.

But that always complains that the property isn't defined. Uh, that's what I wanted to detect...And no, using overwrite="false" is not what I need...this is a simplified example. Anybody have any ideas?

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